Device for removing yarn rests from bobbins



HENRPLEOPOLD BOER 3,298,078

DEVICE FOR REMOVING YARN RESTS FROM BOBBINS Filed Jan. 6, 1965 3Sheets-Sheet l J n- 1967 HENRI-LEOPOLD BOER 3,298,078

DEVICE FOR REMOVING YARN RESTS FROM BOBBINS Filed Jan. 6, 1965 2Sheets-Sheet 2 31a A? 32 17a 17!:

KM.) 33 en 34b 34f i 29 3W1 a b 349 34:14 d

United States Patent Ofifice 3,298,078 Patent ed Jan. 17, 1967 3,298,078DEVICE FOR REMUVTNG YARN RESTS FROM BOBBINS Henri-Leopold Boer, Ghent,Belgium, assignor to M.

Bronwer dz Co., N.V., Hengelo, Netherlands, a limitedliability companyof the Netherlands Filed Jan. 6, 1965, Ser. No. 423,737 4 Claims. (@l.23-20) My invention relates to a device for removing the residual Wasteyarn from bobbin of the type in which a number of relatively movableclaws are arranged in a frame for gripping the bobbin under the residualyarn to be removed, and a pusher is disposed above these claws so as tobe movable in a direction perpendicular to the plane of the claws forpropelling the bobbin from between the claws with the aid of the pusher.

Such a device is described in the US. Patent No. 1,805,- 452, in whichtwo jaws which are relatively movable in a horizontal plane, and thebobbin to be cleaned clamped between the two jaws. This known device is,however, not suitable for cleaning bobbins with various diameters; inthat bobbins with a small diameter are insufficiently gripped, whilebobbins with a greater diameter are only engaged at spaced points aroundtheir circumference, for example, at the locations where the recess ineach claw and the flat portion of the claw merge, these points beingmoreover not situated at equal distances from the center of the bobbin.

My invention aims to provide a device of the abovernentioned kind inwhich the aforementioned difficulties are not experienced and with whichbobbins of a range of different diameters can be cleaned, the yarn massbeing engaged at a sufficient number of points. It is a further objectof my invention to provide a very dependable device of simpleconstruction, and in which protection for the operators is alsoprovided.

The object of my invention is accomplished by providing at least threeclaws connected with pressure members guided so as to be radiallymovable in a mounting element which is secured to the frame, thepressure members being provided with pins which are perpendicular to theplane of movement and which fit in cor-responding cam slots formed in aring turnable relative to the mounting element and shaped to effectradial movements of the claws upon turning of the ring, and fluidpressure operated means for effecting the turning of the cam ring.

It is a further object of my invention to provide a safety ring which iscapable of movement towards the claws and preferably mounted thereabove,the safety ring, when moved, operating a control member by which theupward movement of the pusher is effected.

It is a still further object of my invention to provide a control memberoperated by a safety ring which can thereby effect a direct connectionbetween a source of fluid under pressure and a membrane or diaphragm foroperating a control valve whereby the driving piston for the pusherreturns to its uppermost position.

The invention is clarified with reference to the accompanying drawings,showing the device according to the invention.

FIGURE 1 is a vertical sectional view of the device according to theinvention;

FIGURE 2 shows a plan view of the claws and their operating mechanism;

FIGURE 3 is a diagram of the pneumatic operating system.

As is shown on FIG. 1 the machine consists of a frame 1, which rests onits legs 2. The frame has an erect portion 3 to which a cylinder 4 issecured. In this cylinder 4 there is a reciprocable piston 5 having apiston rod 6 secured thereto and carrying a pusher 7.

Provided in the frame 1 are the claws 8 and their operating mechanism.As is shown in FIGURE 2, there are four of the claws 8 preferably formedof nylon and connected with pressure members 9 which are guided incorrespondingly shaped radially directed grooves 19 provided in astationary mounting ring 11. Each pressure member is provided with anupright pin 12 which fits in a cam slot 13 formed in the undeside of acam ring 14 turnable relative to the stationary ring 11. Each cam slot13 extends generally in the circumferential direction, but is closer tothe outer periphery of ring 14 at one end of the cam slot than at theother end thereof. Turning of the ring 14 will therefore give rise to aradial- 1y directed movement of the pressure members 9 and the claws 8connected therewith. The outer periphery of the ring 14 is connectedwith a piston rod 15 extending from a piston 16 which is reciprocable ina cylinder 17.

The claws 8 should exert a certain pressure against the circumference ofthe bobbin 18 to be cleaned and from which the residual yarn 19 is to beremoved. For that purpose the bobbin 1% should be brought manuallybetween the claws 8 and thereupon operation of the device is initiatedby means of a control member to be described hereinafter,

Upon such initiation of the operation of the device, compressed air isadimtted to the cylinder 17 whereby the ring 14 is turned in such a waythat the four claws 8 are moved radially inward to grip the bobbin 18 atfour locations on its circumference. ()nly when this bobbin is grippedwith a certain force does the operating mechanisrn supply compressed airto cylinder 4, whereby the piston 5 together with the piston rod 6 andthe pusher 7 are moved downwardly to propel the bobbin 18 downwardlyfrom between claws 8 during the last part of the stroke. The residualyarn 19 remains behind on the claws 8 and is stripped from the bobbin.

Provided above the upper plate of the frame is a ring 20, which issecured to a vertical rod 21 slidable in a longitudinal direction in thebearings 22 and 23 carried by the erect portion 3 of the frame. Betweena protruding plate 24, secured to the upper end of the rod 21, and theupper side of the bearing 23 is a compression spring 25 which isdisposed around the rod 21 and which serves to retain the safety ring 20in its uppermost position. When one, on introducing a bobbin into themachine, does not withdraw ones hand in time, the same will be pinchedbetween the pusher 7 and the ring 20 whereby the ring 20 is moveddownwardly so that a cam 26 secured to the rod 21 actuates a safetyvalve 27 which controls the pneumatic control system in such manner thatthe piston 5 is moved upwardly.

The operation of the device is initiated with the aid of a pedal 28which is secured to the legs 2 and which operates a control valve 29.The way this valve operates and the arrangement of the pneumatic controlsystern are represented in FIG. 3.

Compressed air is fed to the pneumatic control system by way of theconnection 30 to a suitable source of compressed air. The compressed airinlet 30 is connected with the port 29a of the valve 29 by way of apressure regulator 31 beyond which is connected a meter 32, in-

dicating the pressure available for operation of the claw operatingcylinder 17. In the rest position of pedal 23, the valve 29 establishesthe communications which are represented in full lines on FIG. 3;whereas, when pedal 28 is depressed, valve 29 establishes thecommunications represented in dotted lines on FIG. 3. In the restposition the compressed air inlet port 2% communicates with the port 17aopening into the space at the left of the piston 16 in cylinder 17, asviewed on FIG. 3. The outlet port 290 of the valve 29, which opens tothe atmosphere, is communicated with port 27d in the rest position andport 27d is, in turn, connected to port 17b opening into cylinder 17 tothe right of piston 16. Thus, the space at the left of the piston 15 isunder pressure when pedal 23 is in the rest position, and the piston isconsequently in its extreme right position, so that the ring 14 isturned in such a way that the claws 8 are spaced apart or retractedradially outward as much as possible. The connection between ports 2%and 17a is communicated with a port 31a of a membrane chamber 31 inwhich the pressure of compressed air supplied to port 17a can act on amembrane 32, to which is fastened the operating rod 33 of the valve 34,so as to hold membrane 32 in a depressed position. This results in thevalve 34 remaining in the represented position, in which the port 34a isconnected with the port 34b and the port 340 is connected with the port34d. Since the port 34a is connected with the pressure piping by way ofthe regulator 35, and the port 34b is connected with the port 4a at thelower end of cylinder 4, the space under the piston in the cylinder 4 isunder pressure; and the space over the piston 5 communicates with theatmosphere by way of the port 412 connected to port 34d whichcommunicates with the port 340 opening to the atmosphere. The piston 5will consequently be in its uppermost position.

The device operates as follows:

On pressing the pedal 28 the communications between the ports of thevalve 29 are established as is indicated by dotted lines. This meansthat the space at the right of the piston 16 is put under pressure byway of the connection from port 17b to port 29d and the valveconnections from port 29d to port 29], while the space at the left ofthe piston 16 communicates with the atmosphere by way of the connectionfrom port 17a to port 2%, and, within the valve, between ports 29b-29c.The piston 16 moves to the left whereby the claws close or move radiallyinward. During such movement there is maintained a certain pressure atthe left of the piston 16 and acting upon the membrane 32, as the aircannot escape fast through the pipes and the valve 29. As a result thevalve 34 is not immediately switched.

When the piston 16 no longer moves because the claws 8 press against thebobbin, the pressure at the left of the piston 16, and which acts on themembrane 32, drops. When this pressure has fallen off below a definitevalue, the valve 34 switches whereby this valve establishes thecommunications which are indicated in dotted lines on FIG. 3. Compressedair at a pressure indicated by a pressure gauge 36 is admitted to thevalve 34 by way of the regulator 35, and passes through valve 34 fromport 34 to port 34d to act in the space within cylinder 4 above piston5, while the space under the piston communicates with the atmosphere byway of the connection through valve 34 between ports 34b-34f. The piston5 moves downwardly and, by way of the piston rod 6 and the pusher 7,moves the bobbin downwardly from between the claws. After the pedal 28is released, the control system returns to its rest position.

The safety valve 27 to be operated by the cam 26 on rod 21 is interposedin a conduit connecting the compressed air inlet 30 with the lineextending from port 17a to port 31a. Actuation of valve 27 results inthat there is a pressure again in the space over the membrane 32 wherebythis membrane is depressed, and the valve 34 establishes thecommunication as represented in full lines in FIG. 3, whereby the piston5 moves immediately upwardly.

As is obvious from the description the invention provides a simpledependable apparatus for removing residual yarn from bobbins, the saidapparatus being capable of dealing with an extensive range of diametersof bobbins. Due to the less complicated construction the device is verydependable while the simple operation allows for the removal of residualyarn from the bobbins at a rate which is considerably faster as comparedwith the old method.

What I claim is:

1. A device for stripping residual yarn from bobbins, comprising aframe, a mounting ring fixed on said frame, at least three pressuremembers guided in said mounting ring for radial movement relativethereto, said pressure members each carrying a claw for radial movementtherewith in a plane common to the plane of movement of the clawscarried by the other pressure members so that the claws can grip abobbin under the residual yarn to be removed therefrom, each of saidpressure members having a pin projecting therefrom perpendicular to saidplane of movement, a cam ring turnable on said mounting ring and havinga cam slot therein for each of said pressure members which receives saidpin projecting from the related pressure member, each cam slot extendinggenerally circumferentially in said cam ring and having its oppositeends at different distances from the outer periphery of the cam ring sothat turning of the latter causes radial movements of said claws toselectively grip and release a bobbin positioned amid said claws,fluid-pressure operated means for turning said cam ring, and a pushermounted on said frame above said claws and being movable perpendicularto said plane of movement of the claws so as to slidably displace abobbin from between said claws while the latter grip the bobbin forstripping the residual yarn therefrom.

2. A device according to claim 1; further comprising a safety ringmounted above said claws and being movable toward the latter, andcontrol means operated in response to movement of said safety ringtoward the claws to effect movement of said pusher in the direction awayfrom said claws.

3. A device according to claim 1; wherein said fiuid pressure operatedmeans includes a first cylinder having a piston reciprocable therein andconnected with said cam ring to turn the latter, a source of fluid underpressure, first valve means interposed between said source and both endsof said cylinder to normally supply fluid under pressure to one end ofsaid cylinder and to exhaust the other end of said cylinder for movingsaid piston in the direction displacing said claws radially outward, anoperating member connected with said first valve means and beingactuable to cause said first valve means to exhaust said one end of thefirst cylinder and to supply fluid under pressure to said other end ofthe latter, whereby said claws are displaced radially inward to grip abobbin therebetween, a second cylinder having a piston reciprocabletherein connected with said pusher to move the latter perpendicular tosaid plane of movement of the claws, second valve means interposedbetween said source and both ends of said second cylinder and having anactuating diaphragm, and conduit means extending from said one end ofsaid first cylinder to apply the pressure of fluid acting thereinagainst said actuating diaphragm of said second valve means, said secondvalve means being operative when the pressure of fluid acting againstsaid diaphragm exceeds a predetermined value to supply fluid underpressure to said second cylinder in the direction for moving said pusheraway from said claws and to reverse the direction in which fluid issupplied to said second cylinder for moving said pusher toward saidclaws when the pressure of fluid in said one end of the first cylinderand acting against said diaphragm falls below said predetermined value.

4. A device according to claim 3; further comprising References Cited bythe Examiner a safety ring mounted above said claws and being mov-UNITED STATES PATENTS b d h 1 d t 2,036,405 4/1936 Gale 28 20 a le towart e atter, an means responslve 0 move- 2,732,609 1/1956 Pgrguson 28 2Oment of said safety ring toward said claws to establis 5 2,907,09110/1959 Ferguson 28-20 communication between said source of fluid underpres- FOREIGN PATENTS sure and said membrane, whereby said second valve957,647 2/1957 Germany.

means causes said secondcylinder to move said pusher MERVIN STEIN,Primary E i away from said claws. 10 L. K. RIMRODT, Assistant Examiner.

1. A DEVICE FOR STRIPPING RESIDUAL YARN FROM BOBBINS, COMPRISING AFRAME, A MOUNTING RING FIXED ON SAID FRAME, AT LEAST THREE PRESSUREMEMBERS GUIDED IN SAID MOUNTING RING FOR RADIAL MOVEMENT RELATIVETHERETO, SAID PRESSURE MEMBERS EACH CARRYING A CLAW FOR RADIAL MOVEMENTTHEREWITH IN A PLANE COMMON TO THE PLANE OF MOVEMENT OF THE CLAWSCARRIED BY THE OTHER PRESSURE MEMBERS SO THAT THE CLAWS CAN GRIP ABOBBIN UNDER THE RESIDUAL YARN TO BE REMOVED THEREFROM, EACH OF SAIDPRESSURE MEMBERS HAVING A PIN PROJECTING THEREFROM PERPENDICULAR TO SAIDPLANE OF MOVEMENT, A CAM RING TURNABLE ON SAID MOUNTING RING AND HAVINGA CAM SLOT THEREIN FOR EACH OF SAID PRESSURE MEMBERS WHICH RECEIVES SAIDPIN PROJECTING FROM THE RELATED PRESSURE MEMBER, EACH CAM SLOT EXTENDINGGENERALLY CIRCUMFERENTIALLY IN SAID CAM RING AND HAVING ITS OPPOSITEENDS AT DIFFERENT DISTANCES FROM THE OUTER PERIPHERY OF THE CAM RING SOTHAT TURNING OF THE LATTER CAUSES RADIAL MOVEMENTS OF SAID CLAWS TOSELECTIVELY GRIP AND RELEASE A BOBBIN POSITIONED AMID SAID CLAWS,FLUID-PRESSURE OPERATED MEANS FOR TURNING SAID CAM RING, AND A PUSHERMOUNTED ON SAID FRAME ABOVE SAID CLAWS AND BEING MOVABLE PERPENDICULARTO SAID PLANE OF MOVEMENT OF THE CLAWS SO AS TO SLIDABLY DISPLACE ABOBBIN FROM BETWEEN SAID CLAWS WHILE THE LATTER GRIP THE BOBBIN FORSTRIPPING THE RESIDUAL YARN THEREFROM.